Nifedipine extended-release tablets should be taken in strict accordance with the doctor’s prescription, it is recommended to swallow, the interval between doses should be not less than 4 hours, and it is recommended to monitor liver function regularly. Nifedipine extended-release tablets are mainly available in 10mg, 20mg, 30mg, due to the fact that this extended-release tablets, if broken, will destroy the structure of the drug, thus weakening the efficacy of the drug, so it should be swallowed, not chewed, according to the doctor’s instructions to choose the appropriate specifications to be taken; if you need to reduce the amount of medicine, as appropriate, but also can also be separated along the “center line”, and then swallowed in half. If you need to reduce the dosage, you can also separate it along the “center line” as appropriate, and then swallow half of the tablet. The drug can be used in the treatment of chronic stable angina, vasospastic angina, and essential hypertension. Depending on the purpose of treatment, the dosage of the drug is 20-40mg per dose, 1-2 times a day. The drug can be taken with food and does not interfere with the absorption of the drug. It should be noted that the drug should not be taken by pregnant women, unstable angina, recent myocardial infarction, severe aortic stenosis, and people who have ever had cardiogenic shock, and the drug should not be used with rifampin. This drug may cause adverse reactions such as headache, redness and swelling of the upper and lower extremities, and redness of the face. It needs to be taken under the guidance of a doctor and standardized treatment as prescribed by the doctor.